JP6736649B2 - アノード触媒層の使用 - Google Patents
アノード触媒層の使用 Download PDFInfo
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- JP6736649B2 JP6736649B2 JP2018238986A JP2018238986A JP6736649B2 JP 6736649 B2 JP6736649 B2 JP 6736649B2 JP 2018238986 A JP2018238986 A JP 2018238986A JP 2018238986 A JP2018238986 A JP 2018238986A JP 6736649 B2 JP6736649 B2 JP 6736649B2
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Description
(i)PtXの二元合金[式中、Xは、Ti、VおよびCrからなる群から選択される金属であり、合金中の白金の原子百分率は、45から80原子%までであり、合金中のXの原子百分率は、20から55原子%までである]および
(ii)PtX合金が分散される担体材料
を含み、
アノード触媒層中の白金の全担持量が0.01から0.2mgPt/cm2までであり、
燃料電池の動作中、最大で5ppmの一酸化炭素を含む水素流がアノード触媒層に供給される、アノード触媒層の使用を提供する。
(i)PtXの二元合金[式中、Xは、Ti、VおよびCrからなる群から選択される金属であり、合金中の白金の原子百分率は、45から80原子%までであり、合金中のXの原子百分率は、20から55原子%までである]および
(ii)PtX合金が分散される担体材料
を含み、
アノード触媒層中の白金の全担持量が0.01から0.2mgPt/cm2までであり、
アノードに最大で5ppmの一酸化炭素を含む水素流を供給することを含む方法を提供する。
(i)PtXの二元合金[式中、Xは、Ti、VおよびCrからなる群から選択される金属であり、合金中の白金の原子百分率は、45から80原子%までであり、合金中のXの原子百分率は、20から55原子%までである]および
(ii)PtX合金が分散される担体材料
を含み、
アノード触媒層中の白金の全担持量が0.01から0.2mgPt/cm2までであり、
燃料電池の動作中、最大で5ppmの一酸化炭素を含む水素流がアノード触媒層に供給されるアノード電極、触媒被覆膜または膜電極接合体の使用を提供する。
剪断ミキサーを使用してカーボンブラックを水中に分散させ、反応容器に移した。K2PtCl4をスラリーに添加して、昇温してNaOHで加水分解した。第2の金属の溶液を懸濁液に添加して、NaOHで中和した。金属の堆積が完了したとき、濾過によって触媒を回収し、可溶性イオンがなくなるまで濾床上において脱塩水で洗浄した。材料を乾燥させ、次いで、不活性雰囲気下において高温でアニーリングした。
K2PtCl4=42.82g(20.00g、0.1025mol Pt)
Cr(NO3)3.9H2O=13.68g(1.78g、0.0342mol Cr)
1M NaOH=必要に応じて
Ketjen EC 300J=28.22g(2.3%水分)=28.89g
アニーリング温度:1000℃で2時間
アニーリングしたPt3Cr触媒を、約80℃において、0.5MのH2SO4中で24時間酸浸出させた。
K2PtCl4(46.62%Pt)=42.90g(20.00g、0.1025mol Pt)
TiCl3溶液(8.9%TiCl3)=88.83g(2.46、0.0513mol Ti)
1M NaOH=必要に応じて
Ketjen EC 300J(4.9%水分)=28.99g(27.54g乾燥)
アニーリング温度:930℃で2時間
K2PtCl4=17.17g(8.00g、0.0411mol Pt)
TiCl3=2.10g(0.65g、0.0136mol Ti)
1M NaOH=必要に応じて
Ketjen EC 300J(2.8%水分)=11.7g
アニーリング温度:930℃で2時間
使用したPt触媒は、Johnson Matthey Fuel Cells Limitedから入手可能なHiSPEC(登録商標) 2000であった。
使用したPtRu触媒は、Johnson Matthey Fuel Cells Limitedから入手可能なHiSPEC(登録商標) 10000であった。
0.5gの実施例1を含む分散液と、触媒担持材料の重量に対して120%の乾燥Nafion重量を目標とした十分な水性Nafion溶液(11%固形物)とを剪断混合して、インクを形成させた。実施例2および3ならびに比較例1および2を使用して、この過程を繰り返した。
熱接着を用いずにCCMをアノード気体拡散層およびカソード気体拡散層と組み合わせて、MEAを形成させた。80℃、7.2psigにおいて、完全に加湿した気体反応物質によってMEA試験を行った。H2をカソード電極に供給することによって得られるアノード分極曲線を、アノード電極に与えられた(i)純粋なH2、(ii)H2中の5ppmの一酸化炭素、および(iii)H2中の2ppmの一酸化炭素を使用して得た。
Claims (9)
- プロトン交換膜燃料電池における一酸化炭素耐性触媒材料を含むアノード触媒層の使用であって、前記触媒材料が、
(i)PtXの二元合金[式中、Xは、Tiであり、合金中の白金の原子百分率は、45から80原子%までであり、合金中のXの原子百分率は、20から55原子%までである]および
(ii)PtX合金が分散される担体材料
を含み、
アノード触媒層中の白金の全担持量が0.01から0.2mgPt/cm2までであり、
燃料電池の動作中、最大で5ppmの低いレベルの一酸化炭素を含む純粋でない水素流がアノードに供給される、アノード触媒層の使用。 - 二元合金中のPtの原子比が、50から75原子%までであり、Xの原子比が、25から50原子%までである、請求項1に記載のアノード触媒層の使用。
- 二元合金が、二元合金と担体材料の全重量に対する白金の重量に基づいて10〜50wt%である、請求項1または2に記載のアノード触媒層の使用。
- アノードがさらに第2の触媒を含む、請求項1から3のいずれか一項に記載のアノード触媒層の使用。
- 第2の触媒が酸素発生触媒である、請求項4に記載のアノード触媒層の使用。
- 一酸化炭素耐性触媒材料を含むアノード触媒層を含むアノード電極の使用であって、前記触媒材料が、
(i)PtXの二元合金[式中、Xは、Tiであり、合金中の白金の原子百分率は、45から80原子%までであり、合金中のXの原子百分率は、20から55原子%までである]および
(ii)PtX合金が分散される担体材料
を含み、
アノード触媒層中の白金の全担持量が0.01から0.2mgPt/cm2までであり、
燃料電池の動作中、最大で5ppmの低いレベルの一酸化炭素を含む水素流がアノード触媒層に供給される、アノード電極の使用。 - 一酸化炭素耐性触媒材料を含むアノード触媒層を含む触媒被覆膜の使用であって、前記触媒材料が、
(i)PtXの二元合金[式中、Xは、Tiであり、合金中の白金の原子百分率は、45から80原子%までであり、合金中のXの原子百分率は、20から55原子%までである]および
(ii)PtX合金が分散される担体材料
を含み、
アノード触媒層中の白金の全担持量が0.01から0.2mgPt/cm2までであり、
燃料電池の動作中、最大で5ppmの低いレベルの一酸化炭素を含む水素流がアノード触媒層に供給される、触媒被覆膜の使用。 - 一酸化炭素耐性触媒材料を含むアノード触媒層を含む膜電極接合体の使用であって、前記触媒材料が、
(i)PtXの二元合金[式中、Xは、Tiであり、合金中の白金の原子百分率は、45から80原子%までであり、合金中のXの原子百分率は、20から55原子%までである]および
(ii)PtX合金が分散される担体材料
を含み、
アノード触媒層中の白金の全担持量が0.01から0.2mgPt/cm2までであり、
燃料電池の動作中、最大で5ppmの低いレベルの一酸化炭素を含む水素流がアノード触媒層に供給される、膜電極接合体の使用。 - アノード、カソードおよびアノードとカソードとの間に配置されたポリマー電解質膜を備える燃料電池を動作させる方法であって、アノードが、一酸化炭素耐性触媒材料を含むアノード触媒層を含み、前記触媒材料が、
(i)PtXの二元合金[式中、Xは、Tiであり、合金中の白金の原子百分率は、45から80原子%までであり、合金中のXの原子百分率は、20から55原子%までである]および
(ii)PtX合金が分散される担体材料
を含み、
アノード触媒層中の白金の全担持量が0.01から0.2mgPt/cm2までであり、
アノードに最大で5ppmの低いレベルの一酸化炭素を含む純粋でない水素流を供給することを含む、方法。
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